Biology of the Large Amoebae

Chapman-Andresen, C

doi:10.1146/annurev.mi.25.100171.000331

Cited by 41 publications

(14 citation statements)

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“…They also concluded that the scales are produced in the Golgi apparatus and eventually deposited on the surface of the plasma membrane by exocytosis. This mode of scale deposition is well documented for chrysomonad flagellates (27,28) and also for filament deposition on the plasma membrane of amebae (8).…”

Section: Discussionmentioning

confidence: 58%

“…They contain degraded prey and residual nondigested matter. The presence of small vesicles surrounding these vacuoles is further evidence that digestion is taking place sincc these vesicles resemble lysosomes (26) secreted by the Golgi apparatus and have been identified as lysosomes in freshwater amc,bae ( 8 ) . The occurrence of algal filaments within Type 111 vacuoles suggests that some nutrition may be obtained from digestion of the alga.…”

Section: Discussionmentioning

confidence: 95%

“…Trichodesiniuin colonies were fixed by suspending them in 10 ml of seawater at 25 C and adding 10 ml of 6% (w/v) glutaraldehyde prepared in 0.2 M cacodylate buffer, pH, 8.0 (in seawater). T h e final fixative was 3% (w/v) glutaraldehyde in 0.1 sf cacodylate buffer.…”

Section: Methodsmentioning

confidence: 99%

“…The average number of merozoites per meront in the 3 generations was 10 (5-15). I4 (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19), and 7.5 (6-16) : and the average size was 4.4 x 2.1 (4.1-5.9 x 1.8-2.2) pm, 4.2 x 1.8 (4.0-4.8 x 1.5-2.0) pm: and 5.4 x 1.8 (5.2-7.8 x 1.6-2.0) pm. respectively.…”

mentioning

confidence: 99%

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Fine Structure of a Marine Ameba Associated with a Blue‐Green Alga in the Sargasso Sea*,^†

Anderson

1977

The Journal of Protozoology

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SYNOPSIS An ameba, bearing a fringe of scales on the plasmalemma surface, dwells among the filaments of the colonial, blue‐green alga Trichodesmium thiebautii (Sournia), and preys upon bacteria growing within the colony. The cytoplasm is clearly differentiated into a fine fibrillar ectoplasm at the periphery of the cell and a central endoplasm containing most of the membranous organelles. The nucleus contains a spheroidal nucleolus which is centrally located, and a double membrane containing pores. The tubular mitochondria, microbodies, lysosomes, and endoplasmic reticulum are typical for protozoa. The Golgi apparatus consists of an array of elongate flattened cisternae. One surface is associated with a fine fibrillar layer and the opposite surface contains electron‐dense vesicles (perhaps primary lysosomes) and scale‐containing vesicles that appear to be the origin of the scales deposited on the plasma membrane. Three kinds of bacteria‐containing vacuoles are presnt: (a) vacuoles surrounded by 3 membranes and containing bacteria that are either healthy or in an early stage of digestion, (b) singlemembrane vacuoles which are food vacuoles that become converted to digestive vacuoles, and (c) larger vacuoles resembling those in (b) which contain prey in an advanced stage of digestion. The presence of amebae within pelagic algal communities provides further evidence for the diversity of their habitats in the ocean.

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Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Fine Structure of a Marine Ameba Associated with a Blue‐Green Alga in the Sargasso Sea*,^†

Anderson

1977

The Journal of Protozoology

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“…It is regrettable that our knowledge of food uptake at levels different from those of the phagocytic vesicles in T. pyriformis is so scanty, when compared to our knowledge of pinocytosis in the large amoebae. Here extensive and fruitful studies have revealed the importance of adsorption of charged molecules, the existence of inducers of pinocytosis, and the timing and the extent of the uptake of both high-and low-molecular weight compounds: for reviews see HOLTER (44,45,46) and CHAP-MAN-ANDRESEN (7,8,9) (105)). The outer membrane, the plasma membrane, covers the entire surface of the cell, also the cilia; immediately beneath the plasma membrane is a mosaic of flat, membrane-bounded ~alveoli,,; cilia and mucocysts emerge from the underlying ectoplasm between adjacent alveoli (PITELKA (75)).…”

Section: Pinocytic Vacuoles and Vesiclesmentioning

confidence: 99%

Nutrient uptake in Tetrahymena pyriformis

Rasmussen

1976

Carlsberg Res. Commun.

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Several morphological structures have been implicated in nutrient uptake in the ciliate protozoon, Tetrahymena pyriformis: food vacuoles, various types of vesicles and the plasma membrane. It is the object of this report to discuss the roles of these organelles in food uptake. Measurements of multiplication rates under conditions where food vacuole formation could be controlled experimentally suggested that the food vacuoles (about 5 rtm in diameter) were essential for rapid cell multiplication in various standard growth media. If, however, concentrations of certain specific nutrients (different for different strains of T. pyriformis) were high, then the cells could multiply rapidly even when food vacuoles were absent. Furthermore, multiplication rates of cells supplied with particulate or dissolved egg albumin as the amino acid source, suggested that the food vacuoles took up particulate egg albumin well, but dissolved egg albumin poorly. The role in food uptake of vesicles with a diameter of less than 1 vm remains largely unknown. Our present knowledge of them is not yet sufficiently detailed to permit estimations of the rates with which they are formed or of their total number per cell. The plasma membrane has carrier-mediated uptake sites for a number of nutrients such as amino acids and nucleosides. It is likely that this type of uptake mechanism plays a quantitatively important role in T. pyriformis whenever such compounds are present in the extracellular fluid.

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Prokaryotic Symbionts of Amoebae and Flagellates

Jeon¹

2006

The Prokaryotes

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Biology of the Large Amoebae

Cited by 41 publications

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Fine Structure of a Marine Ameba Associated with a Blue‐Green Alga in the Sargasso Sea*,^†

Fine Structure of a Marine Ameba Associated with a Blue‐Green Alga in the Sargasso Sea*,^†

Nutrient uptake in Tetrahymena pyriformis

Prokaryotic Symbionts of Amoebae and Flagellates

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Biology of the Large Amoebae

Cited by 41 publications

References 0 publications

Fine Structure of a Marine Ameba Associated with a Blue‐Green Alga in the Sargasso Sea*,†

Fine Structure of a Marine Ameba Associated with a Blue‐Green Alga in the Sargasso Sea*,†

Nutrient uptake in Tetrahymena pyriformis

Prokaryotic Symbionts of Amoebae and Flagellates

Contact Info

Product

Resources

About

Fine Structure of a Marine Ameba Associated with a Blue‐Green Alga in the Sargasso Sea*,^†

Fine Structure of a Marine Ameba Associated with a Blue‐Green Alga in the Sargasso Sea*,^†